Concise Perspective and Previous Surveys W HEN reviewing research in rotary-wing aeroelasticity (RWA), it is important to mention a few historical facts. The Wright brothers flew in 1903, and Sikorsky built and started flying the first operational helicopter, the R-4 or (VS-316), in 1942. The R-4 was a three-bladed helicopter with a rotor diameter of 11.6 m and was powered by a 185-hp engine. T...

Title of dissertation: DYNAMICS AND AEROELASTICITY OF HOVER CAPABLE FLAPPING WINGS: EXPERIMENTS AND ANALYSIS Beerinder Singh, Doctor of Philosophy, 2006 Dissertation directed by: Professor Inderjit Chopra Department of Aerospace Engineering This dissertation addresses the aerodynamics of insect-based, bio-inspired, flapping wings in hover. An experimental apparatus, with a bio-inspired flapping...

Optimal thickness distributions of aeroelastic flapping shells" (2013). a r t i c l e i n f o a b s t r a c t The severe weight limitations of flapping wing micro air vehicles necessitates the use of thin flexible wings, which in turn requires an aeroelastic modeling tool for proper numerical characterization. Furthermore, due to the unconventional nature of these vehicles, wing design guidelin...

This paper discusses a methodology of analyzing the flight dynamic stability of a flapping wing Micro Air Vehicle (MAV) in hover. The flexible flapping wings are modeled by a strain-based geometrically nonlinear beam formulation, coupled with an empirical aerodynamic formulation for load calculation on the wings surfaces. Wing flapping kinematics is described using a set of Euler angles. Nonlin...

By combining the aeroelastic and vortex-forced flutter modes of a thin plastic strip, its oscillation frequency can be confined to scale monotonically with fluid velocity. This principle has been used to produce a low-cost, mm-scale anemometer that measures air speed to ±(5% + 0.5m/s) from 118m/s. The device uses a 2mm slot-type photointerrupt detector to monitor the fundamental frequency of a ...

Title of Dissertation: CFD Based Unsteady Aerodynamic Modeling for Rotor Aeroelastic Analysis Jayanarayanan Sitaraman, Doctor of Philosophy, 2003 Dissertation directed by: Associate Professor James D. Baeder Department of Aerospace Engineering A Computational Fluid Dynamics (CFD) analysis is developed for 3-D rotor unsteady aerodynamic load prediction. It is then coupled to a rotor structural a...

Macroscopic, microscopic, and mesoscopic lumped-parameter models of shape memory alloy wires subjected to axial loads and new flutter prediction methods of a steady and a non-steady aeroelastic system will be presented with some comparison to previous studies.

Abstract A parked wind turbine can be subjected to large yaw angles, which causes vortex shedding. Under some particular inflow conditions, the interaction between shed vorticity and blade structure could lead Vortex-Induced Vibrations (VIV). VIV are an instability where response grows until it reaches a limit cycle oscillation. In this paper, we will focus on last part of response. We see that...